In certain industries, such as oil and gas, concentration is especially acute, with only two or three auditors ruling the market.

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Thus, over the course of a few decades, the concentration of the gas in the atmosphere will return to pre-industrial levels.

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Climate sensitivity is a key parameter for estimating the long-term temperature increase expected from a doubling of the concentration of greenhouse gas emissions in the atmosphere.

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"Rising imports of oil and gas into OECD regions and developing Asia, together with the growing concentration of production in a small number of countries, would increase our susceptibility to supply disruptions and sharp price hikes, " Tanaka said.

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It takes a certain minimum level of helium concentration to make it economically viable to separate out the helium from the natural gas.

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